Dr. Steven D. Johnson Profile

Dr. Steven D. Johnson

Research Associate (Physics & Astronomy) at Univ of Glasgow

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Publications (9)

Proceedings Article | 13 March 2024 Presentation + Paper

Transmission of hidden images within noise

Steven Johnson, Alex McMillan, Stefan Frick, John Rarity, Miles Padgett

Proceedings Volume 12912, 129120U (2024) https://doi.org/10.1117/12.3000546

KEYWORDS: Optical transmission, Background noise, Quantum information, Quantum correlations, Data transmission, Quantum protocols, Quantum optical communication, Quantum engineering, Quantum detection, Photodetectors

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Proceedings Article | 30 November 2023 Paper

Quantum correlations for hiding images in noise

Steven Johnson, Alex McMillan, Stefan Frick, John Rarity, Miles Padgett

Proceedings Volume 12795, 127950A (2023) https://doi.org/10.1117/12.2691065

KEYWORDS: Quantum correlations, Quantum information, Quantum noise, Background noise, Quantum limits, Optical transmission, Data transmission, Quantum protocols, Quantum optical communication, Quantum engineering

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Proceedings Article | 30 November 2023 Paper

Drone-based gas leak detection system for use in industry

Angus MacGruer, Steven Johnson, Kyle Nutt, Miles Padgett, Graham Gibson

Proceedings Volume 12795, 1279503 (2023) https://doi.org/10.1117/12.2691068

KEYWORDS: Industry, Methane, Signal processing, Visualization, Semiconductor lasers, Safety, Pipes, Light sources, Light absorption, Gases

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Proceedings Article | 9 March 2022 Presentation

Noise-tolerant, single pixel imaging with a quantum heralding source

Steven Johnson, Alex McMillan, Cyril Torre, Stefan Frick, John Rarity, Miles Padgett

Proceedings Volume PC12016, PC1201623 (2022) https://doi.org/10.1117/12.2608561

KEYWORDS: Photons, Signal to noise ratio, Light sources, Interference (communication), Target detection, Sensors, Remote sensing, Pulsed laser operation, Optical testing, Light

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Proceedings Article | 5 March 2021 Presentation

LIDAR using a deep-learning approach

Steven Johnson, Miles Padgett, Catherine Higham, Roderick Murray-Smith

Proceedings Volume 11703, 117030N (2021) https://doi.org/10.1117/12.2576884

KEYWORDS: LIDAR, Time metrology, Temporal resolution, Stereoscopy, Single photon, Reconstruction algorithms, Projection systems, Picosecond phenomena, Modulators, Laser applications

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Proceedings Article | 1 April 2020 Presentation

Single-pixel imaging lidar using a deep learning basis (Conference Presentation)

Steven Johnson, Catherine Higham, Roderick Murray-Smith, Miles Padgett

Proceedings Volume 11354, 113541F (2020) https://doi.org/10.1117/12.2554737

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SPIE Journal Paper | 29 December 2017

Real-time computational photon-counting LiDAR

Matthew Edgar, Steven Johnson, David Phillips, Miles Padgett

OE, Vol. 57, Issue 03, 031304, (December 2017) https://doi.org/10.1117/12.10.1117/1.OE.57.3.031304

KEYWORDS: LIDAR, Digital micromirror devices, Sensors, 3D image processing, Imaging systems, Optical computing, Electronics, Image restoration, Video, Reconstruction algorithms

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Proceedings Article | 25 September 2017 Open Access

CMOS sensors for atmospheric imaging

Jérôme Pratlong, David Burt, Paul Jerram, Frédéric Mayer, Andrew Walker, Robert Simpson, Steven Johnson, Wendy Hubbard

Proceedings Volume 10562, 105622N (2017) https://doi.org/10.1117/12.2296044

KEYWORDS: Sensors, Silicon, Astronomical imaging, CMOS sensors, Photodiodes, Capacitance, Magnesium, Atmospheric sensing, Dielectrics, Ions

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Recent European atmospheric imaging missions have seen a move towards the use of CMOS sensors for the visible and NIR parts of the spectrum. These applications have particular challenges that are completely different to those that have driven the development of commercial sensors for applications such as cell-phone or SLR cameras. This paper will cover the design and performance of general-purpose image sensors that are to be used in the MTG (Meteosat Third Generation) and MetImage satellites and the technology challenges that they have presented. We will discuss how CMOS imagers have been designed with 4T pixel sizes of up to 250 μm square achieving good charge transfer efficiency, or low lag, with signal levels up to 2M electrons and with high line rates. In both devices a low noise analogue read-out chain is used with correlated double sampling to suppress the readout noise and give a maximum dynamic range that is significantly larger than in standard commercial devices. Radiation hardness is a particular challenge for CMOS detectors and both of these sensors have been designed to be fully radiation hard with high latch-up and single-event-upset tolerances, which is now silicon proven on MTG. We will also cover the impact of ionising radiation on these devices. Because with such large pixels the photodiodes have a large open area, front illumination technology is sufficient to meet the detection efficiency requirements but with thicker than standard epitaxial silicon to give improved IR response (note that this makes latch up protection even more important). However with narrow band illumination reflections from the front and back of the dielectric stack on the top of the sensor produce Fabry-Perot étalon effects, which have been minimised with process modifications. We will also cover the addition of precision narrow band filters inside the MTG package to provide a complete imaging subsystem. Control of reflected light is also critical in obtaining the required optical performance and this has driven the development of a black coating layer that can be applied between the active silicon regions.

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Proceedings Article | 27 July 2016 Paper

A 9 megapixel large-area back-thinned CMOS sensor with high sensitivity and high frame-rate for the TAOS II program

Jérôme Pratlong, Shiang-Yu Wang, Matthew Lehner, Paul Jorden, Paul Jerram, Steven Johnson

Proceedings Volume 9915, 991514 (2016) https://doi.org/10.1117/12.2233034

KEYWORDS: Telescopes, CMOS sensors, Cryogenics, Sensors, Transistors, Stars, Capacitance, Temperature metrology, Cameras, Back illuminated sensors

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Showing 5 of 9 publications

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